<!doctype html>
<html>
<head>
    <meta charset="UTF-8">
    <title>响应式【网页】</title>
    <link rel="stylesheet" href="css/style.css">
</head>
<body>
<h1>响应式【网页】</h1>
<div class="wrapper clearfix">
    <div class="wwl">左侧的内容</div>
    <div class="wwl">中间的内容</div>
    <div class="wwl">右侧的内容</div>
</div>
</body>
</html>